// 仅选择JavaScript
// + 仅选择Erlang
// + 选择JavaScript和Erlang
// + 选择所有编程语言

// + 选择名字input
// + 选择邮件和名字input


'use strict'

var js = $('#para-1');
console.log(js);

var el=$('.color-red.color-green');
console.log(el);

var jsel = $('.color-green');
 console.log(jsel);

var all=$('.color-red,.color-green,.color-black');
console.log(all);

 var na=$('input[name=name1]');
 console.log(na);

 var ne=$('input[name=name1],input[name=email]');
 console.log(ne);